Respuesta :

From the picture, we can see that

[tex]\sin\theta=\dfrac HB\implies\dfrac{\sin\theta}C=\dfrac H{BC}[/tex]

[tex]\sin\beta=\dfrac HC\implies\dfrac{\sin\beta}B=\dfrac H{BC}[/tex]

which means

[tex]\dfrac{\sin\theta}C=\dfrac{\sin\beta}B[/tex]